基于前馈控制的SVC中减小电压波动的方法

The Method of Reducing Voltage Oscillation in Feedforward Controlled SVC

介绍了一种用于静止型动态无功补偿装置SVC中,尤其是能实现对直流换流站无功补偿电容器或滤波器投切时可减小电压波动的方法。通过SVC接收到系统投切无功补偿电容器或滤波器小组(简称无功小组)的命令时增大TCR触发角参考值或减少TCR触发角参考值,减小SVC对无功功率的消耗量,即增加SVC的容性无功输出。即在投切无功小组的瞬间通过在SVC输出导纳值上叠加抑制无功小组投切产生无功波动所需要的导纳调整值,有效解决了由于SVC存在20ms的响应时间导致输出滞后的问题,从而使得母线上的无功波动尽量小。

A static style dynamic reactive power compensation equipment SVC is introduced, especially for decreasing voltage oscillation when reactive capacitor or filter is switched on/off in DC convertor station. Increasing or decreasing the reference angle of TCR triggering angle by receiving the command when system switch on/off reactive compensative capacitor or filter banks （reactive banks in short）. In this way, the loosing of SVC reactive power can be decreased, that means SVC capacitive reactive power increased. At the time of switching on/off reactive bank, an adjusting admittance for preventing reactive admittance, which was generated by switching on/off reactive bank, shall be added on SVC output admittance. This efficiently solves the problem of output lag, due to SVC has 20ms responding time; furthermore, making reactive oscillation on busbar is as small as possible.